The Cadillac CTS, produced between 2014 and 2019, is a midsize luxury sedan known for its performance, elegant design, and advanced technology. Its electrical system, including the fuse box and relay components, is essential for ensuring the vehicle’s operational efficiency and reliability.
The fuse box in the Cadillac CTS from 2014 to 2019 contains various fuses that protect specific electrical circuits throughout the vehicle. These circuits power critical components such as the engine control module, lighting systems, infotainment features, climate control, and more. Fuses are designed to interrupt the electrical flow in the event of an overload or short circuit, thereby preventing damage to sensitive electronics.
Relays in the Cadillac CTS act as electrically operated switches responsible for controlling high-current circuits. They play a crucial role in the precise activation and deactivation of functions like the starter motor, fuel pump, air conditioning compressor, and power windows or seats. Efficient power distribution by relays ensures that each component receives the correct voltage for optimal performance.
Regular inspection and maintenance of the fuse box and relays are essential to ensure the Cadillac CTS operates smoothly. This includes checking fuses for signs of wear or damage, ensuring secure relay connections, and promptly addressing any electrical issues that may arise. Proper care of these components helps maintain the vehicle’s electrical integrity, enhancing safety and driving satisfaction for owners of the Cadillac CTS from 2014 to 2019.
MUST READ: DYI – How to Check Car Fuses?
(2014-2019) Cadillac CTS fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Cadillac CTS 2014-2019 fuse assignment
- Cigar lighter / power outlet fuses in the Cadillac CTS are the fuses №. 19 (Auxiliary power outlet) and №. 20 (Lighter) in the Instrument panel fuse box (2017-2019).
Year of production: 2014, 2015, 2016, 2017, 2018, 2019
Passenger compartment
Fuse Box Location
The fuse box is located on the driver’s side of the instrument panel, behind the cover.
Fuse box diagram
Assignment of the fuses and relays in the instrument panel
| № | Description |
|---|---|
| Mini Fuses | |
| 2 | Motorized Cupholder |
| 3 | Electric Steering Column Lock |
| 4 | 2014-2016: Data Link Connector 2017-2019: Not Used |
| 5 | 2014-2017: Heater, Ventilation, and Air Conditioning Control 2018: Not Used |
| 6 | Tilt and Telescoping Steering Column |
| 8 | 2014-2016: Spare 2017-2019: Data link connector |
| 9 | Glove Box Release |
| 10 | Shunt |
| 11 | Body Control Module 1 |
| 12 | Body Control Module 5 |
| 13 | 2014-2016: Spare 2017-2019: Body control module 6 |
| 14 | Spare |
| 15 | 2014-2016: Spare 2017-2019: Body control module 7 |
| 16 | 2014-2016: Spare 2017-2019: Transmission control module |
| 17 | Spare |
| 18 | Spare |
| 19 | 2014-2016: Spare 2017-2019: Auxiliary power outlet |
| 20 | 2014-2016: Spare 2017-2019: Lighter |
| 21 | 2014-2016: Spare 2017-2019: Wireless charger |
| 22 | Sensing Diagnostic Module/Automatic Occupant Sensing |
| 23 | Radio/DVD/Heater, Ventilation, and Air Conditioning |
| 24 | Display |
| 25 | Heated Steering Wheel |
| 26 | Wireless Charger |
| 27 | Steering Wheel Switches |
| 28 | Spare |
| 29 | 2014-2017: Spare 2018: Visor vanity lamp |
| 30 | Spare |
| J-Case Fuses | |
| 31 | 2014-2017: Spare 2018: Retained accessory power/Accessory |
| 32 | 2014-2016, 2018: Spare 2017: Retained accessory power |
| 33 | Front Heater, Ventilation, and Air Conditioning Blower |
| Circuit Breakers | |
| CB1 | 2014-2016: Retained Accessory Power/Accessory Power Outlet Power 2017-2019: Retained Accessory Power |
| CB7 | Spare |
| Relays | |
| K10 | 2014-2016, 2018: Retained Accessory Power/Accessory 2017: Retained Accessory Power |
| K605 | Logistics |
| K644 | 2014-2016: Glove Box Release 2017-2019: Retained accessory power/Glove box release |
Engine compartment
Fuse Box Location
Fuse box diagram (2014-2016)
Assignment of the fuses and relays in the Engine compartment (2014-2016)
| № | Description |
|---|---|
| 1 | Not Used |
| 2 | Not Used |
| 3 | Passenger motorized seat belt (if equipped) |
| 4 | Body Control Module 6 |
| 5 | Not Used |
| 6 | Driver Power Seat |
| 7 | Not Used |
| 8 | Headlamp Washer Relay (if equipped) |
| 9 | Not Used |
| 10 | Not Used |
| 11 | Not Used |
| 12 | Not Used |
| 13 | Passenger Power Seat |
| 14 | Body Control Module 5 |
| 15 | Front Wiper |
| 16 | Not Used |
| 17 | Headlamp Washer (if equipped) |
| 18 | Not Used |
| 19 | Antilock Brake System Pump |
| 20 | Antilock Brake System Valve |
| 21 | AIR Pump (if equipped) |
| 22 | Driver motorized seat belt |
| 23 | Wiper Control Relay |
| 24 | Wiper Speed Relay |
| 25 | Engine Control Module Relay |
| 26 | AIR Pump Relay (if equipped) |
| 27 | Spare/Heated Seat 2 |
| 28 | Body Control Module 1/Spare |
| 29 | AFS AHL/Pedestrian Protection (if equipped) |
| 30 | Passenger Window Switch |
| 31 | Body Control Module 7 |
| 32 | Sunroof |
| 33 | Not Used |
| 34 | AOS Display/MIL Ignition |
| 35 | Rear Electrical Center Ignition |
| 36 | Spare PT Fuse |
| 37 | Oxygen Sensor |
| 38 | Ignition Coils/Injectors |
| 39 | Ignition Coils/Injectors/Spare |
| 40 | Engine Control Module |
| 41 | Fuel Heater |
| 42 | AIR Solenoid Relay (if equipped) |
| 43 | Washer |
| 44 | Not Used |
| 45 | Front Washer Relay |
| 46 | Not Used |
| 47 | Instrument Panel Body Ignition |
| 48 | Fuel System Control Module Ignition |
| 49 | Heated Steering Wheel |
| 50 | Steering Column Lock (if equipped) |
| 51 | Coolant Pump (if equipped) |
| 52 | Coolant Pump Relay (if equipped) |
| 53 | Air Conditioning Compressor Clutch |
| 54 | AIR Solenoid (if equipped) |
| 55 | Transmission Control Module/Spare |
| 56 | Headlamp Low Relay (if equipped) |
| 57 | Headlamp High Relay |
| 58 | Starter |
| 59 | Starter Relay |
| 60 | Run/Crank Relay |
| 61 | Vacuum Pump Relay (if equipped) |
| 62 | Air Conditioning Control Relay |
| 63 | Adaptive Headlamp Leveling (if equipped) |
| 64 | Left High Intensity Discharge Headlamp (if equipped) |
| 65 | Right High Intensity Discharge Headlamp (if equipped) |
| 66 | Headlamp High Left/Right |
| 67 | Horn |
| 68 | Horn Relay |
| 69 | Cooling Fan |
| 70 | Aero Shutter |
| 71 | Transmission Control Module Ignition |
| 72 | Engine Control Module Ignition |
| 73 | Brake Vacuum Pump (if equipped) |
| 74 | Not Used |
Fuse box diagram (2017-2019)
Assignment of the fuses and relays in the engine compartment (2017-2019)
| № | Description |
|---|---|
| 1 | Not Used |
| 2 | Not Used |
| 3 | Passenger motorized safety belt (if equipped) |
| 4 | Not Used |
| 5 | Not Used |
| 6 | Driver Power Seat |
| 7 | Not Used |
| 9 | Not Used |
| 10 | Not Used |
| 11 | Not Used |
| 12 | Not Used |
| 13 | Passenger Power Seat |
| 14 | Not Used |
| 15 | Passive entry/Passive start/Front wipers |
| 16 | Not Used |
| 17 | Headlamp Washer (if equipped) |
| 18 | Not Used |
| 19 | ABS pump |
| 20 | ABS valve |
| 21 | Not Used |
| 22 | Driver motorized safety belt |
| 26 | Not Used |
| 27 | –/Heated Seat 2 |
| 28 | –/Reverse lock out |
| 29 | Adaptive forward lighting, Automatic headlamp leveling/ Pedestrian protection |
| 30 | Not Used |
| 31 | Passenger window switch |
| 32 | Not Used |
| 33 | Sunroof |
| 34 | Front wiper |
| 35 | Steering column lock |
| 36 | Rear bussed electrical center/Ignition |
| 37 | –/Malfunction Indicator Lamp/Ignition |
| 38 | Aeroshutter |
| 39 | O2 sensor/Emissions |
| 40 | 2017: Ignition coil/Injectors 2018: Ignition coil even/O2 sensor |
| 41 | 2017: –/Ignition coil/Injectors 2018: Ignition coil odd |
| 42 | Engine control module (if equipped) |
| 43 | Not Used |
| 44 | Not Used |
| 45 | Front Washer Relay |
| 48 | Instrument panel/Body/Ignition |
| 49 | Fuel system control module/Ignition |
| 50 | Heated steering wheel (if equipped) |
| 51 | Engine control module/Ignition (if equipped) |
| 52 | TCM/Ignition (if equipped) |
| 53 | Coolant pump |
| 55 | Not Used |
| 56 | Transmission control module/– (if equipped) |
| 64 | Automatic headlamp leveling (if equipped) |
| 65 | Left HID headlamp (if equipped) |
| 66 | Right HID headlamp |
| 67 | High-beam headlamps |
| 68 | Headlamp leveling motor |
| 69 | Horn |
| 71 | Coolant fan |
| 72 | Starter 2 |
| 73 | Brake vacuum pump (if equipped) |
| 74 | Starter 1 |
| 75 | Air conditioning clutch |
| 76 | Not Used |
| Relays | |
| 8 | Headlamp washer (if equipped) |
| 23 | Wiper control relay |
| 24 | Wiper speed |
| 25 | Engine control module |
| 46 | Rear washer |
| 47 | Front washer |
| 54 | Coolant pump (if equipped) |
| 57 | Low-beam headlamp |
| 58 | High-beam headlamp |
| 59 | Run/Crank |
| 60 | Starter 2 |
| 61 | Vacuum pump (if equipped) |
| 62 | Starter 1 |
| 63 | Air conditioning control (if equipped) |
| 70 | Horn |
Luggage compartment
Fuse Box Location
It is located in the left side of the luggage compartment, behind the cover.
Fuse box diagram
Assignment of the fuses and relays in the Luggage compartment (2014-2019)
| № | Description |
|---|---|
| 1 | 2014-2016: Electronic Limited Slip Differential/DC DC Transformer (if equipped) 2017-2019: Rear driver control module/DC DC transformer (if equipped) |
| 2 | Left Window |
| 3 | Body Control Module 8 |
| 4 | Alternate current inverter (if equipped) |
| 5 | Passive Entry / Passive Start / Battery 1 |
| 6 | Body Control Module 4 |
| 7 | Heated Mirrors |
| 8 | Amplifier |
| 9 | Rear Window Defogger |
| 10 | Glass Break |
| 11 | Trailer Connector (if equipped) |
| 12 | OnStar (If Equipped) |
| 13 | Right Window |
| 14 | Electric Parking Brake |
| 15 | Not Used |
| 16 | Trunk Release |
| 17 | 2014-2017: Run Relay (if equipped) 2018: Trailer Relay |
| 18 | Logistics Relay (if equipped) |
| 19 | 2014-2016, 2018: Logistics Fuse (if equipped) 2017: Not Used |
| 20 | Rear Window Defogger Relay |
| 21 | Mirror Window Module |
| 22 | 2014-2016: Pedestrian Protection 2017-2019: Not Used |
| 23 | Canister Vent |
| 24 | 2014-2017: Pedestrian Protection 2018: Body control module 2 |
| 25 | Rear Vision Camera (if equipped) |
| 26 | Front Ventilated Seats (if equipped) |
| 27 | Side blind zone alert/Lane departure warning/External object calculating module |
| 28 | Trailer/Sunshade (if equipped) |
| 29 | Rear Heated Seats (if equipped) |
| 30 | Semi-Active Damping System (if equipped) |
| 31 | 2014-2016: Transfer Case Control Module/Electronic Limited Slip Differential (if equipped) 2017-2019: Traction control module/Rear control drive module |
| 32 | Theft Module/Universal Garage Door Opener/Rain Sensor |
| 33 | Ultrasonic parking assist (if equipped) |
| 34 | Radio/DVD (if equipped) |
| 35 | 2014-2016: Spare 2017-2019: Exhaust valve (V-series) |
| 36 | Trailer (if equipped) |
| 37 | Fuel Pump/Fuel System Control Module |
| 38 | 2014-2016: Not Used 2017: Fuel pump 2018: Fuel pump prime/Exhaust valve (V-series) |
| 39 | Not Used |
| 40 | 2014-2016: Not Used 2017: Exhaust valve 2018: Run crank 2 (V-series) |
| 41 | 2014-2016: Not Used 2017: Run/Crank 2 2018: Fuel pump prime/ Run crank 2 |
| 42 | Memory Seat Module (if equipped) |
| 43 | Body Control Module 3 |
| 44 | Not Used |
| 45 | Battery Regulated Voltage Control |
| 46 | Engine Control Module / Battery |
| 47 | Not Used |
| 48 | Not Used |
| 49 | Trailer Module (if equipped) |
| 50 | Door Lock Security |
| 51 | Rear Closure Release |
| 52 | 2014-2016: Not Used 2017-2019: Rear closure |
| 53 | Not Used |
| 54 | Door Lock Security |
| 55 | Not Used |
| 56 | Fuel Door (if equipped) |
Conclusion
For owners and enthusiasts of classic Cadillac CTS 2014-2019, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Cadillac’s craftsmanship and innovation in the automotive industry during that era.
